{
  "id": "UBL-SR-20",
  "country": "EU",
  "syntax": "ubl",
  "group": "syntax",
  "severity": "fatal",
  "severity_note": "fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-18.",
  "spec": "Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL",
  "statement": "Payee identifier shall occur maximum once, if the Payee is different from the Seller",
  "statement_lang": "en",
  "context": "cac:PayeeParty",
  "test": "(count(cac:PartyIdentification/cbc:ID[upper-case(@schemeID) != 'SEPA']) <= 1) and ((cac:PartyName/cbc:Name) != (../cac:AccountingSupplierParty/cac:Party/cac:PartyLegalEntity/cbc:RegistrationName))",
  "meaning": "The payee identifier shall occur at most once if the payee is different from the seller. The statement has a comma and no period. It says shall, and it capitalizes Payee and Seller. The flag is fatal. The context is cac:PayeeParty. The published test counts party identification identifiers whose scheme is not SEPA. That scheme comparison is upper-case(@schemeID) != 'SEPA' with a straight quote and a space on each side of !=. The count comparison has a space before <= and a space after it. The test also requires the payee name to differ from the seller legal-entity registration name.",
  "fix": "When the payee is different from the seller, send at most one payee identifier whose scheme is not SEPA.",
  "example_fail": "The payee has two party identification identifiers whose scheme is not SEPA.",
  "example_pass": "The payee has one such identifier, or none, and the payee name differs from the seller legal-entity registration name.",
  "example_note": "Illustration of the condition in the official statement. Not an example published by the source.",
  "source_url": "https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/UBL-SR-20/",
  "source_retrieved": "2026-10-18",
  "last_verified": "2026-10-18"
}